"Security has been enhanced in all major installations in the city including the airport and railway stations," said a police officer. Police were conducting checks at vital installations like the airport and the Howrah and Sealdah railway stations.

Security arrangements were also enhanced at the Bagdogra airport in Darjeeling district. Security personnel were also keeping a vigil on important landmarks including the state secretariat, the Victoria Memorial, the Howrah Bridge, Vidya Sagar Setu and the Kolkata Metro.

In a major security breach, terrorists entered the Pathankot Indian Air Force (IAF) base and engaged the security forces in a fierce gunfight. At least four terrorists were killed and at least two security personnel lost their lives in the attack.